11 78 545 Replacing both oxygen monitoring sensors (N54, N54T)

Special tools required:

WARNING: Risk of burning!
Work should only be carried out on an exhaust system that has cooled down.

Necessary preliminary work

Remove rear UNDERBODY PROTECTION

Installation note:

If an oxygen sensor is to be reused, only apply a thin and uniform coat of NEVER-SEEZ compound to thread.

The part of the oxygen monitoring sensor which projects into the exhaust branch (sensor ceramic) must not be cleaned or come into contact with lubricant.

Disconnect plug connection for oxygen monitoring sensor.

Release monitoring sensor (1) with special tools 11 7 030 and 11 9 150 .

IMPORTANT: When using special tool 11 7 030 in conjunction with special tool 11 9 150 , it is essential to reduce the prescribed tightening torque by 3 Nm.

Fig 1: Removing Monitoring Sensor With Special Tools 11 7 030 And 11 9 150

Courtesy of BMW OF NORTH AMERICA, INC.

Tightening torque: 11 78 1AZ .

Installation note:

Cable color black, cylinders 1 to 3.

NOTE: Release insulation (2) in direction of arrow.

Disconnect plug connection for oxygen monitoring sensor.

Release monitoring sensor (1) with special tool 11 7 020 .

Tightening torque: 11 78 1AZ .

Installation note:

Cable color grey, cylinders 4 to 6.

Fig 2: Removing Monitoring Sensor Using Special Tool 11 7 020

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check function of DME control unit.